Do you have mounds? If you said they're everywhere...sounds like you may Not have the mound making type. In that case, only bait will work. You need to figure out what type of fire ants you have. The ones I have here are European Fire Ants. They do not make mounds. They create extensive tunnel systems, for hundreds of feet, then have more queens with more tunnels, covering acres & acres. Their home base is who knows where, down in the tunnels, underground. I have followed ants carrying yellow bait, just to see if I could figure out where home was...yeah right, 50 to 75 feet in all different directions. They are also in my yard and I have found them over the entire two acres, as well as the gravel roadway & neighboring yards & farm fields...I'm talkin acres & acres worth. There is no eradicating this particular type, since they're tunneling systems are so widespread. All I can do here is manage the number using spinosad bait, the only stuff that works & is deemed an organic treatment.
The local Ag Extension actually came out here & collected some ants to be properly identified after I emailed them photos. You may want to do that before trying treatments. I too, 1st tried borax. It had no effect at all. Other types of fire ant bait can be damaging to other beneficial insects, etc. Apparently in my case, these ants have been here for many decades. The previous owner & former family farm owner both told me they recalled stinging ants over many decades. I'm the only one that had them identified. The little horrors actually climbed up my shovel handle, got inside my garden gloves & stung the crap out of my hands. My hands swelled up for a week! They climb up shoes inside pant legs...yeah one got my inner thigh. You ever see a crazy woman rip her jeans off running around swatting & screaming in her underwear, you know she just got stung bad. They climb up your shirt & sting the back of your neck under the ponytail. They hitch a ride on your clothing & end up in the house. Try to swat them off, they have a death grip on skin & clothes. Try to step on them, full weight, they emerge unscathed from the ball they curled into. You literally need a freaking hammer to smash them, I'm not kidding. Their exoskeleton is armor!
The product I sprinkle down & see the ants carrying off is Antixx granular. Their numbers will diminish with ongoing use, but they will never totally ever be gone.
They invaded Maine & northern states in the 1930s. Look up Eleanor Groden. I spoke with her, she told me the sad truth about these nasty ants.
https://www.maine.gov/dacf/php/gotpests/bugs/factsheets/fire-ants-me.pdf
https://entnemdept.ufl.edu/creatures/urban/ants/myrmica_ruba.htm
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